Soft shifting: reprogram or shift kit? Tranny guys? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Tim240Z · 06-24-2005, 11:25 AM

I have a 1999 suburban 1500 l31 vortec and 4L60E in my 71. The shifts seem to be very soft and lackluster. The suburban donor vehicle had 62,xxx miles on it, and I do not know the history on the vehicle, except that, apart from the accident damage, it appeared well taken care of.

Can I resolve the sloppy shifting by reprogramming the VCM (I have TunerCat), or would the installation of a shift kit be required, or is this a symptom of greater issues requiring a freshening up of the tranny (don't particularly want to hear that option).

Also, the truck seems to surge a bit right at 40mph. Is that the TC locking and unlocking?

06-24-2005, 11:25 AM	#1
Tim240Z Senior Member Join Date: Jan 2005 Location: LAX area, So Cal Posts: 499	Soft shifting: reprogram or shift kit? Tranny guys? I have a 1999 suburban 1500 l31 vortec and 4L60E in my 71. The shifts seem to be very soft and lackluster. The suburban donor vehicle had 62,xxx miles on it, and I do not know the history on the vehicle, except that, apart from the accident damage, it appeared well taken care of. Can I resolve the sloppy shifting by reprogramming the VCM (I have TunerCat), or would the installation of a shift kit be required, or is this a symptom of greater issues requiring a freshening up of the tranny (don't particularly want to hear that option). Also, the truck seems to surge a bit right at 40mph. Is that the TC locking and unlocking? __________________ 1972 Suburban C20 454/TH700R4, eaton-corporate 4.10 (looking for 3.7) Sold: 71 Cheyenne 20 Installed a 99 5.7L L31/4L60E from Suburban 1500 (2005)



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